Sofa



FIG. 1 is a front elevational view of a sofa showing our new design;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a side elevational view thereof;

FIG. 4 is a top plan view thereof; and,

FIG. 5 is a perspective view thereof.

The broken lines showing the throw pillows is for illustrative purposes only and forms no part of the claimed design. 

We claim the ornamental design for a sofa, as shown and described. 